Castell-Castell was a county in the Holy Roman Empire, ruled by a branch of the Counts of Castell. It was established as a partition of Castell-Remlingen in 1668, and it was partitioned between itself and Castell in 1709. It annexed the County of Castell in 1772, and was mediatised to Bavaria in 1806.Genealogisches Handbuch des Adels, Fürstliche Häuser XVI. "Castell". C.A. Starke Verlag, 2001, pp. 187-190. (German). .
On 7 March 1901 the Castell-Castell branch, along with the one of Castell-Rüdenhausen line were raised to the hereditary rank of Prince in primogeniture with the style of Serene Highness by Luitpold, Prince Regent of Bavaria.
Counts of Castell-Castell (1668–1806) Wolfgang Theodoric (1668–1709) Augustus Francis Frederick (1709–1767) reigned mutually with Charles Frederick Gottlieb (Count of Castell-Remlingen) (1709–1717) and Wolfgang George II (1709–1736) and Christian Frederick Charles (Count of Castell-Rüdenhausen) (1736–1773) Albert Frederick Charles (1773–1806) mutually with Christian Frederick (later Count of Castell-Rüdenhausen) (1773–1803)
(Mediatized) Counts of Castell-Castell Friedrich Ludwig (1810–1875) Carl (1875–1886) Friedrich Carl (1886–1901)
(Mediatized) Princes of Castell-Castell
Friedrich Carl, Count 1886–1901, 1st Prince 1901–1923 (1864–1923), married 1895 Countess Gertrud of Stolberg-Wernigerode Carl, 2nd Prince 1923–1945 (1897–1945), married Princess Anna-Agnes of Solms-Hohensolms-Lich Albrecht, 3rd Prince 1945–2016 (1925–2016), married Marie Luise, Princess of Waldeck and Pyrmont Ferdinand, 4th Prince 2016–present (born 1965), married Countess Marie-Gabrielle of Degenfeld-Schonburg Carl, Hereditary Count of Castell-Castell (born 2001) Count Johannes (born 2011)
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